text field not working in safari

I'm working on an online eBay profit forecasting calculator here

I can't seem to get the input fields to work in safari and mobile safari. They work fine in FF & Chrome. I click into them, but nothing shows when I type. I've been searching google but can't seem to find any clues. I'm wondering if I'm missing something in the css. Here's my css for the input fields:

input {
    width: 155px;
    padding-left: 5px;
    height: 24px;
    cursor: text;
    font-size: 18px;
    font-weight: bold;
    border: none;
    border-radius: 3px;
    box-shadow: inset 1px 1px 2px black;
    -moz-box-shadow: inset 1px 1px 2px black;
    -webkit-box-shadow: inset 1px 1px 2px black;
    background-color: #F8FBEF;
 }